Thrombectomy device and system

Abstract

The embodiment of the present application provides a thrombectomy device and a thrombectomy system, wherein the thrombectomy device comprises: a thrombectomy stent having a plurality of expansion states, and one expansion state of the thrombectomy stent corresponds to one outer diameter of the thrombectomy stent; and an adjusting assembly adapted to switch the expansion state of the thrombectomy stent. By using the above technical scheme, the pressure caused by the thrombectomy stent on the inner wall of the blood vessel can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical device technology, and in particular to a thrombectomy device and thrombectomy system. Background Technology

[0002] A thrombectomy device is a medical device used to clear vascular embolisms and can be used in conjunction with a sheath device. After the sheath device is inserted into the blood vessel, the thrombectomy stent of the thrombectomy device enters the blood vessel through the sheath device and, under the directional guidance of a guidewire, performs the thrombectomy operation on the embolus in the blood vessel.

[0003] During thrombectomy, the thrombectomy stent of the device contacts the inner wall of the blood vessel to remove emboli attached to it. The significant difference between the stent's diameter and the inner wall's diameter can exert considerable pressure on the vessel wall. Therefore, developing an improved technical solution to reduce the pressure exerted by the thrombectomy stent on the vessel wall has become a pressing technical problem. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a thrombectomy device and a thrombectomy system that can reduce the pressure exerted by the thrombectomy stent on the inner wall of the blood vessel.

[0005] First, this embodiment of the invention provides a thrombectomy device, the thrombectomy device comprising:

[0006] The thrombectomy stent has multiple expansion states, and one expansion state of the thrombectomy stent corresponds to one outer diameter of the thrombectomy stent.

[0007] An adjustment component is provided to switch the expansion state of the thrombectomy bracket.

[0008] Optionally, the adjustment component includes:

[0009] Main gear shift component;

[0010] The secondary gear component is adapted to cooperate with the main gear component to form multiple gears, and one gear is adapted to an expansion state of the thrombectomy bracket;

[0011] A first driving component is connected to the main gear shift component and is adapted to drive the main gear shift component to move relative to the secondary gear shift component to switch gears.

[0012] Optionally, the adjustment component further includes:

[0013] The housing, wherein the secondary gear position component is disposed within the housing via a rotating shaft and is adapted to rotate relative to the primary gear position component via the rotating shaft;

[0014] The second driving member abuts against one end of the sub-gear member and is adapted to rotate the sub-gear member so that the sub-gear member disengages from the main gear member;

[0015] A reset member is clamped between the other end of the secondary gear member and the housing, and is adapted to rotate the secondary gear member so that the secondary gear member abuts against the primary gear member.

[0016] Optionally, the housing has a through hole;

[0017] The second driving member passes through the through hole into the housing and slides in cooperation with the through hole;

[0018] One end of the second driving member is located inside the housing, and the other end is located outside the housing.

[0019] Optionally, the second driving member is provided with a limiting part, the outer diameter of which is larger than the inner diameter of the through hole, and the limiting part is located inside the housing.

[0020] Optionally, the main gear shift member has multiple tooth-like structures;

[0021] The sub-gear component is adapted to cooperate with the plurality of toothed structures to form a plurality of gears.

[0022] Optionally, when the secondary stop and the toothed structure cooperate to form the stop, the secondary stop is adapted to restrict the thrombectomy bracket from switching the expansion state.

[0023] Optionally, the plurality of toothed structures are arranged sequentially along the axial direction of the main gear.

[0024] Optionally, the adjustment component further includes:

[0025] case;

[0026] The first traction member is adapted to connect the distal end of the thrombectomy bracket and the main stop member;

[0027] The second traction member is adapted to connect the proximal end of the thrombectomy bracket and the housing;

[0028] The second traction component is sleeved outside the first traction component and can move relative to it along the axial direction.

[0029] Optionally, the adjustment component further includes:

[0030] The storage component is fitted outside the second traction component and can move relative to it along the axial direction.

[0031] Optionally, the thrombectomy device further includes:

[0032] A first filter element covers the side wall of the thrombectomy bracket.

[0033] Optionally, the thrombectomy stent includes:

[0034] The first part, located at the proximal end of the thrombectomy bracket, is adapted to form at least one port along the axial direction of the thrombectomy bracket;

[0035] The second part is located at the distal end of the thrombectomy bracket and is adapted to form a semi-enclosed space with the first part.

[0036] This invention also provides a thrombectomy system, comprising:

[0037] The thrombectomy device is the thrombectomy device described in any of the foregoing embodiments;

[0038] A sheath device adapted for passage of the thrombectomy device.

[0039] Optionally, the sheath device includes:

[0040] The sheath body is adapted to allow the thrombectomy device to pass through;

[0041] A sheath support, located at the distal end of the sheath body, is adapted to guide the thrombectomy device into the sheath body;

[0042] The second filter element covers the side wall of the sheath support.

[0043] Using the above technical solution, one expansion state of the thrombectomy stent corresponds to one outer diameter of the thrombectomy stent. By setting the thrombectomy stent in the thrombectomy device to have multiple expansion states, the thrombectomy device has multiple outer diameters, which can be adapted to the inner walls of blood vessels of different diameters. By switching the expansion state of the thrombectomy stent through the adjustment component in the thrombectomy device, a suitable outer diameter of the thrombectomy stent can be selected to match the current diameter of the inner wall of the blood vessel, thereby reducing the pressure of the thrombectomy stent on the inner wall of the blood vessel. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this specification, the drawings used in the description of the embodiments of this specification or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A schematic diagram of a thrombectomy device according to an embodiment of the present invention is shown;

[0046] Figure 2 A schematic diagram of the structure of an adjustment component according to an embodiment of the present invention is shown;

[0047] Figure 3 A schematic diagram of a thrombectomy stent according to an embodiment of the present invention is shown;

[0048] Figure 4 A schematic diagram of the structure of a first part according to an embodiment of the present invention is shown;

[0049] Figure 5 A schematic diagram of another first part in an embodiment of the present invention is shown;

[0050] Figures 6 to 9 A schematic diagram of the application scenario of the thrombectomy system in an embodiment of the present invention is shown. Detailed Implementation

[0051] Thrombectomy stents are medical devices used to clear vascular embolisms. After being deployed within the blood vessel, the stent expands and, guided by a guidewire, removes emboli attached to the vessel wall. The expanded stent has a preset outer diameter. If the stent expands in a blood vessel with an inner diameter smaller than its preset outer diameter, the vessel wall will constrain the stent, ensuring that it contacts the vessel wall while its current outer diameter remains smaller than the preset outer diameter.

[0052] The radial interaction force between the vessel wall and the thrombectomy stent is related to the difference between the vessel's inner diameter and the pre-set outer diameter of the stent. A thrombectomy stent with a significantly different pre-set outer diameter from the vessel's inner diameter will exert greater pressure on the vessel wall. Therefore, providing improved technical solutions to reduce the pressure exerted by the thrombectomy stent on the vessel wall has become an urgent technical problem to be solved.

[0053] To address the aforementioned problems, this invention provides a thrombectomy device. The thrombectomy stent is configured to have multiple expansion states. By adjusting the components to switch the expansion states of the thrombectomy stent, the difference between the preset outer diameter of the thrombectomy stent in the current expansion state and the inner diameter of the blood vessel wall is reduced, thereby reducing the pressure exerted by the thrombectomy stent on the blood vessel wall.

[0054] To enable those skilled in the art to better understand and implement the embodiments of the present invention, the following describes the concept, scheme, principle, and advantages of the embodiments of the present invention in detail with reference to the accompanying drawings and through specific application examples.

[0055] For ease of description and understanding, the proximal and distal ends are first described in the embodiments of this specification. The "proximal end" refers to the end closer to the operator during the thrombectomy process, and the "distal end" refers to the end farther away from the operator during the thrombectomy process.

[0056] Reference Figure 1 , Figure 1 This is a schematic diagram of a thrombectomy device provided in an embodiment of the present invention.

[0057] In some embodiments of the present invention, the thrombectomy device M may include an adjustment component 1 and a thrombectomy bracket 2;

[0058] The thrombectomy bracket 2 can have multiple expansion states, and one expansion state of the thrombectomy bracket 2 corresponds to one outer diameter of the thrombectomy bracket 2.

[0059] The adjustment component 1 can switch the expansion state of the thrombectomy bracket 2.

[0060] Specifically, the expansion state refers to the state after the thrombectomy stent is released.

[0061] Using the above technical solution, one expansion state of the thrombectomy stent corresponds to one outer diameter of the thrombectomy stent. By setting the thrombectomy stent in the thrombectomy device to have multiple expansion states, the released thrombectomy stent can have multiple outer diameters. By switching the expansion state of the thrombectomy stent through the adjustment component in the thrombectomy device, a suitable outer diameter of the thrombectomy stent can be selected to match the inner diameter of the current blood vessel wall, reducing the difference between the inner diameter of the thrombectomy stent and the inner diameter of the blood vessel wall, thereby reducing the pressure of the thrombectomy stent on the blood vessel wall.

[0062] In practice, the thrombectomy stent may also have a retracted state.

[0063] Specifically, the contracted state is the state before the thrombectomy stent is released.

[0064] As an optional implementation, the outer diameter of the thrombectomy stent corresponding to the expanded state is greater than the outer diameter of the thrombectomy stent corresponding to the contracted state.

[0065] As an optional implementation, refer to Figure 1 and Figure 2 , Figure 2 This is a schematic diagram of the structure of an adjustment component provided in an embodiment of the present invention. The adjustment component 1 may include a main gear component 101 and a secondary gear component 102. The secondary gear component 102 may cooperate with the main gear component 101 to form multiple gears, and one gear is adapted to an expansion state of the thrombectomy bracket 2.

[0066] Specifically, a gear position is adapted to an expansion state of the thrombectomy bracket, that is, a gear position corresponds to an outer diameter of the thrombectomy bracket in an expansion state, and at least one gear position corresponds to an outer diameter in an expansion state that is different from the outer diameters in expansion states corresponding to other gear positions.

[0067] As an optional implementation, continue to combine with reference Figure 1 and Figure 2 The adjustment component 1 may also include a first drive component 103, which is connected to the main gear component 101.

[0068] In practical applications, the first driving member is connected to the main gear member, so that the main gear member can be moved relative to the secondary gear member by driving the first driving member, thereby switching gears to change the expansion state of the thrombectomy stent, so that the outer diameter of the thrombectomy stent is adapted to the inner diameter of the blood vessel wall.

[0069] As an optional implementation, continue to combine with reference Figure 1 and Figure 2 The first driving member 103 is coaxially arranged with the main gear member 101, and the outer diameter of the first driving member 103 is larger than that of the main gear member 101.

[0070] In actual use, the outer diameter of the first drive component is larger than that of the main gear component, which makes it easier for the first drive component to drive the main gear component and improves the comfort during the driving process.

[0071] In specific implementations, the first driving component and the main gear shift component can be configured according to specific circumstances. For example, the first driving component and the main gear shift component can be integrally configured; or, for another example, the first driving component can be threadedly connected to the main gear shift component.

[0072] As an optional implementation, the adjustment component may further include a housing, with the first drive element located outside the housing.

[0073] As a specific example, let's continue to refer to... Figure 1 and Figure 2 The housing 104 is a tubular structure, and the main shift member 101 passes through the housing 104 and is connected to the first drive member 103 outside the housing 104. The main shift member 101 can move relative to the housing 104 along the axial direction of the housing 104 under the drive of the first drive member 103.

[0074] As an optional implementation, the adjustment component may further include a first traction member and a second traction member, wherein the first traction member is used to connect the distal end of the thrombectomy bracket and the main stop member, and the second traction member is used to connect the proximal end of the thrombectomy bracket and the housing, and the second traction member and the first traction member can move relative to each other.

[0075] In actual use, the first traction member connects the distal end of the thrombectomy bracket to the main gear member, and the second traction member connects the proximal end of the thrombectomy bracket to the housing. When the first driving member drives the main gear member to move relative to the housing to switch gears, the first traction member moves relative to the second traction member, which can change the distance between the distal and proximal ends of the thrombectomy bracket, thereby switching the expansion state of the thrombectomy bracket.

[0076] As a specific example, continue to refer to Figure 1Both the first traction member 105 and the second traction member 106 are tubular structures, with the second traction member 106 sleeved outside the first traction member 105.

[0077] In practical use, the change in the distance between the distal and proximal ends of the thrombectomy bracket is related to the relative displacement of the first and second traction members along the corresponding axial direction. Compared with a linear structure, a tubular structure can increase the structural strength of the first and second traction members along the corresponding axial direction, thereby improving the consistency between the change and the relative displacement, and further improving the consistency between the gear position and the outer diameter of the corresponding expansion state.

[0078] As an optional implementation, the thrombectomy device may further include a storage component for storing the thrombectomy bracket.

[0079] As a specific example, continue to refer to Figure 1 The storage component 107 is sleeved outside the second traction component 106, and the storage component 107 and the second traction component 106 can move relative to each other along the axial direction.

[0080] In actual use, before the thrombectomy stent is released, the thrombectomy stent is stored in the storage component. When the thrombectomy stent moves to the target position of the blood vessel, the storage component is moved proximally relative to the second traction component to release the thrombectomy stent. When the thrombectomy stent leaves the blood vessel after thrombectomy, the storage component is moved distally relative to the second traction component to store the thrombectomy stent that captured the embolus.

[0081] As an optional implementation, the proximal end of the storage component can be detachably connected to the housing.

[0082] As a specific example, continue to refer to Figure 1 The proximal end of the storage component 107 is connected to the distal end of the housing 104 via a Luer connector 108.

[0083] In actual use, before the thrombectomy bracket is released, the proximal end of the receiving component is separated from the distal end of the housing; after the thrombectomy bracket is released, the proximal end of the receiving component is fixed to the housing via a Luer connector to prevent the receiving component from moving axially relative to the second traction component and interfering with the thrombectomy process.

[0084] In specific implementation, the main gear shift component can be configured according to the specific circumstances so that the secondary gear shift component and the main gear shift component can cooperate to form multiple gears.

[0085] As an optional implementation, continue to refer to Figure 2 The main gear shifter 101 has a toothed structure a, and the secondary gear shifter 102 can cooperate with the toothed structure a to form a gear.

[0086] Specifically, when the secondary gear component abuts against the toothed structure of the primary gear component, the secondary gear component and the toothed structure cooperate to form a gear. When the secondary gear component and the toothed structure cooperate to form a gear, the secondary gear component can restrict the thrombectomy bracket from switching expansion states.

[0087] As an optional implementation, continue to refer to Figure 2 The tooth-like structure a may have a first limiting surface a1, a second limiting surface a2, and a third limiting surface a3. The first limiting surface a1 and the third limiting surface a3 are arranged opposite each other as sidewalls of the tooth-like structure, and the second limiting surface a2 is connected to the first limiting surface a1 and the second limiting surface a2 as the bottom surface of the tooth-like structure.

[0088] As an optional implementation, the number of the tooth-like structures can be multiple.

[0089] As an optional implementation, continue to refer to Figure 2 Multiple tooth-shaped structures a are arranged sequentially along the axial direction of the main gear 101.

[0090] In actual use, the main gear shifter is driven by the first drive member to move relative to the housing along the axis toward the far end of the housing. During the movement, the secondary gear shifter can cooperate with different toothed structures to form different gears.

[0091] In specific implementation, the main gear shifter and the auxiliary gear shifter can be in a contacting state or a separated state, and the contacting state and the separated state between the auxiliary gear shifter and the main gear shifter can be switched between each other.

[0092] As an optional implementation, continue to refer to Figure 2 The adjustment group may also include a rotating shaft 109, which is disposed on the inner wall of the housing 104. The secondary gear 102 is disposed in the housing 104 via the rotating shaft 109 and can rotate via the rotating shaft 109.

[0093] In practical applications, the secondary gear shifter can rotate relative to the primary gear shifter via a rotating shaft, thereby allowing the secondary gear shifter to contact the primary gear shifter and to separate from the primary gear shifter.

[0094] As an optional implementation, continue to refer to Figure 2 The secondary gear shifter 102 may include a first end and a second end located on both sides of the rotating shaft 109, respectively; the adjustment assembly may also include a second drive member 110 and a reset member 111, wherein the second drive member 110 may abut against the first end of the secondary gear shifter 102, and the reset member 111 may be clamped between the second end of the secondary gear shifter 102 and the inner wall of the housing 104.

[0095] In actual use, the second driving member abuts against the first end of the sub-gear member. The sub-gear member can be disengaged from the main gear member by driving the second driving member to rotate. The reset member is sandwiched between the other end of the sub-gear member and the housing. It can provide a reset force to the other end of the sub-gear member pointing towards the main gear member, so that the sub-gear member abuts against the main gear member.

[0096] As a specific example, continue to refer to Figure 2 The reset member 111 is an elastic member in a compressed state. One end of the reset member 111 abuts against the inner wall of the housing 104, and the other end abuts against the second end of the secondary gear member 102. The housing 104 may have a through hole b. The second driving member 110 passes through the through hole b and is installed in the housing 104. One end of the second driving member 110 is located inside the housing 104 and abuts against the first end of the secondary gear member 102. The other end of the second driving member 110 is located outside the housing 104. The second driving member 110 slides in cooperation with the through hole b.

[0097] In actual use, the secondary gear shift member abuts against the first limiting surface of the toothed structure of the primary gear shift member to form a gear. At this time, the end of the second driving member outside the housing is driven in the direction pointing to the axis of the primary gear shift member. The second driving member will drive the secondary gear shift member to rotate, so that the secondary gear shift member separates from the first limiting surface. At this time, the second end of the secondary gear shift member compresses the reset member. When the second driving member is stopped in the direction pointing to the primary gear shift member, the compressed reset member provides a reset force in the direction pointing to the primary gear shift member, thereby driving the secondary gear shift member to abut against the first limiting surface again to form a gear.

[0098] As an optional implementation, the angle β between the first limiting surface at the contact position extending along the axis away from the main gear and the direction pointing from the contact position to the rotating shaft is not greater than 90 degrees.

[0099] As a specific example, continue to refer to Figure 2 The included angle β is 60 degrees.

[0100] In actual use, when the secondary gear component is in contact with the first limiting surface, if the main gear component is subjected to a driving force along the axis in a direction away from the thrombec bracket, since the included angle β is 60 degrees, the end of the secondary gear component that is in contact with the first limiting surface will move downward until it simultaneously contacts the second limiting surface. At this time, the secondary gear component stops rotating, the secondary gear component and the toothed structure form a gear, and the main gear component stops moving along the axis in a direction away from the thrombec bracket.

[0101] It is understood that the above implementation is only an example to illustrate the possible implementation of the included angle β and the restriction of the main gear component to continue moving along the axis away from the thrombec support. It should not be construed as a limitation of the present invention. The included angle β is not necessarily no greater than 90 degrees. For example, the included angle β can be 120 degrees. In this case, if the driving force on the main gear component along the axis away from the thrombec support is less than the preset driving force, the main gear component can continue to move along the axis away from the thrombec support.

[0102] It is understood that the above implementation is merely an illustrative example, used to illustrate possible cooperation methods between the second driving end and the first end of the sub-gear component, and between the reset component and the second end of the sub-gear component. It should not be construed as a limitation of the present invention. The cooperation methods between the second driving end and the first end of the sub-gear component, and between the reset component and the second end of the sub-gear component, are not necessarily contradictory. For example, the second driving end and the first end of the sub-gear component can also be rotatably connected, and the reset component and the second end of the sub-gear component can also be fixedly connected.

[0103] As an optional implementation, continue to refer to Figure 2 The end face of the secondary gear position 102 that abuts against the first limiting surface a1 is an arc surface.

[0104] In actual use, the second end of the sub-gear component abuts against the first limiting surface. When the second driving component drives the first end of the sub-gear component along the axis pointing to the main gear component, there is friction between the second end of the sub-gear component and the first limiting surface. By setting the end face of the sub-gear component that abuts against the first limiting surface to be an arc surface, the friction between the second end of the sub-gear component and the first limiting surface can be reduced, thereby reducing the magnitude of the force applied to the second driving component and facilitating gear switching during use.

[0105] In practice, a suitable reset component can be selected based on the specific circumstances. For example, the reset component can be one of a spring, a spring sheet, or the like.

[0106] In specific implementation, the through hole and the second driving member can be configured according to the specific circumstances to prevent the second driving member from moving entirely outside the housing.

[0107] As an optional implementation, continue to refer to Figure 2 The second driving member 110 is provided with a limiting part 112, the outer diameter of the limiting part 112 is larger than the inner diameter of the through hole b, and the limiting part 112 is located inside the housing 104.

[0108] In practical use, by setting the limiting part with an outer diameter larger than the inner diameter of the through hole, the second driving member can be prevented from moving out of the housing along the through hole.

[0109] It is understood that the above implementation is only an example to illustrate possible ways to prevent the second driving member from moving along the through hole to the outside of the housing, and should not be construed as a limitation of the present invention. The second driving member does not necessarily have to be provided with the limiting part. For example, it can also be set such that the outer diameter of the end of the second driving member located in the housing is larger than the inner diameter of the through hole.

[0110] As an optional implementation, continue to refer to Figure 2 The toothed structure a is an annular groove toothed structure coaxially arranged with the main gear position component; correspondingly, the adjusting component may include multiple combinations, with the rotating shaft 109, the secondary gear position component 102, the reset component 111, and the through hole b as a combination, and the multiple combinations may be distributed in a circumferential array along the main gear position component.

[0111] In actual use, multiple combinations of the main gear components distributed in a circumferential array can balance the radial forces on the main gear components.

[0112] As an optional implementation, refer to Figure 1 and Figure 3 , Figure 3 A schematic diagram of a thrombectomy stent according to an embodiment of the present invention is shown. The thrombectomy stent 2 may include a first part 21 and a second part 22 along the axial direction, wherein the first part 21 is located at the proximal end of the thrombectomy stent 2 and is connected to the second part 22 and the second traction member 106 respectively, and the second part 22 is located at the distal end of the thrombectomy stent 2, forming a semi-enclosed space with the first part 21.

[0113] Specifically, the first part is used to form the port of the thrombectomy bracket, and the second part is used to provide space to accommodate the thrombus.

[0114] In actual use, the sidewall of the first part abuts against the inner wall of the blood vessel. When the thrombectomy stent moves axially, the first part can peel off the emboli in the blood vessel and on the inner wall of the blood vessel. The semi-enclosed space formed by the second part and the first part can collect and contain the peeled emboli.

[0115] As an optional implementation, the outer diameter of the first part is greater than or equal to the outer diameter of the second part.

[0116] Specifically, the dimension corresponding to the projection of the first part onto a section perpendicular to the axial direction of the thrombectomy bracket is greater than or equal to the dimension corresponding to the projection of the second part onto a section perpendicular to the axial direction of the thrombectomy bracket.

[0117] In practical use, by setting the outer diameter of the first part to be greater than or equal to the outer diameter of the second part, when the thrombectomy stent moves, the first part can be used to remove emboli from the blood vessel and the inner wall of the blood vessel.

[0118] In practice, the number of ports formed in the first step can be set according to the specific circumstances.

[0119] As an optional implementation, refer to Figure 3 and Figure 4 , Figure 4 A schematic diagram of the structure of a first part in an embodiment of the present invention is shown. The first part 21 is a ring structure, forming only one port C.

[0120] Specifically, the proximal end of the thrombectomy bracket has only one port in the axial direction for the thrombus to enter.

[0121] In practical use, the proximal end of the thrombectomy stent is configured to have only one port for emboli to enter in the axial direction. This can preserve the integrity of the emboli entering the second part to the greatest extent, and prevent the emboli entering the second part from being broken into small fragments and escaping into the blood vessel from the semi-enclosed space formed by the second part and the first part, thereby improving the one-time removal rate of emboli.

[0122] As an optional implementation, continue to combine with reference Figure 3 and Figure 4 The port C formed by the first part 21 may have a component extending axially along the thrombectomy bracket.

[0123] In practical use, compared to the first part being configured as a closed-loop structure perpendicular to the thrombectomy stent, when the thrombectomy stent moves axially, the first part can simultaneously peel off emboli from the entire circumferential surface of the blood vessel wall. By configuring the first part as a closed-loop structure extending along the axial direction of the thrombectomy stent, only a portion of the first part contacts the emboli at the beginning of the movement of the thrombectomy stent, thus peeling off the emboli and reducing the force required to drive the thrombectomy stent, thereby reducing the difficulty of thrombectomy.

[0124] Furthermore, in some examples, continue to refer to Figure 3 The first part 21 may also include a support member d, which can increase the structural strength of the first part 21 in the radial direction of the thrombectomy bracket.

[0125] As a specific example, continue to refer to Figure 3 The support member d is a mesh structure formed by spirally winding multiple support unit members d0.

[0126] As an optional implementation, the thrombectomy bracket may further include a connector for connecting the thrombectomy bracket and the second traction member.

[0127] As a specific example, let's continue to refer to... Figure 3 and Figure 4 The connector 23 is fixed to the first part 21; at the same time, the connector 23 is snapped into the far end of the second traction member 106.

[0128] It is understood that the above implementation is merely an illustrative example used to illustrate the connection method between the connector and the second traction member, and should not be construed as a limitation of the present invention. The connection method between the connector and the second traction member can also be other configurations, as long as it ensures that the connector remains stationary relative to the second traction member along its axial direction. For example, the connector and the second traction member can also be welded together for fixation.

[0129] As another optional implementation, refer to Figure 5 , Figure 5 A schematic diagram of another first part in an embodiment of the present invention is shown. The first part 21 can form multiple ports C.

[0130] Specifically, the proximal end of the thrombectomy stent has multiple ports formed by the first part in the axial direction.

[0131] In practical use, the proximal end of the thrombectomy stent is configured to have multiple ports for emboli to enter in the axial direction. When the thrombectomy stent moves in the axial direction, the first part can not only peel off the emboli in the entire circumferential direction of the inner wall of the blood vessel, but also divide the emboli to reduce their volume, making it easier for the emboli to enter the semi-enclosed space formed by the second part and the first part.

[0132] As a specific example, continue to refer to Figure 5 The first part 21 may include a first cutting member 211 and a second cutting member 212. The first cutting member 211 is an annular structure with the axis of the thrombectomy bracket as the axis. The second cutting member 212 is a rod-shaped structure extending radially and axially along the thrombectomy bracket. There are multiple second cutting members 212. One end of each second cutting member 212 is connected to the first cutting member 211, and the connection positions are distributed in a circumferential array along the thrombectomy bracket. The other end of each second cutting member 212 extends radially and axially along the thrombectomy bracket and is connected to the second traction member 106. Two adjacent second cutting members 212 form a group. Each group of second cutting members 212 forms a port C with the first cutting member 211. The number of ports C corresponds to the number of second cutting members 212.

[0133] In practical use, when the thrombectomy stent moves axially, the first cutting element can peel off the emboli from the entire circumferential surface of the blood vessel wall, and each of the second cutting units can divide the emboli along the radial direction of the thrombectomy stent.

[0134] As another specific example, continue to refer to Figure 5 The second cutting member 212 can be Y-shaped, with one end of the second cutting member 212 connected to the second traction member 106 and the other ends connected to different positions of the first cutting member 211.

[0135] As an optional implementation, continue to refer to Figure 5 The first cutting element 211 may include multiple first cutting element units 211a, which are connected end to end to form a ring structure.

[0136] In specific implementation, the shape of the first cutting unit can be selected according to the specific circumstances so that the formed annular structure can be expanded or reduced radially.

[0137] For example, the first cutting unit may be one or more of the following shapes: V-shaped, W-shaped, semi-circular, wavy, or otherwise.

[0138] As an optional implementation, the thrombectomy stent may further include a puncture section, and the second section may include multiple linear components. The puncture component is used to puncture the embolus to form a passage for the thrombectomy stent to pass through, and the multiple linear components are spirally wound to form a net-like structure to collect and contain the embolus detached from the first section.

[0139] As a specific example, continue to refer to Figure 3 One end of each linear member 22a is connected to the first part 21, and the connection positions are distributed in a circumferential array along the first part 21. The other end of each linear member 22a is spirally extended along the axial direction of the thrombectomy bracket and then connected to the puncture member 24.

[0140] As a specific example, continue to refer to Figure 3 The puncture member 24 is also connected to the first traction member 105, and a guide wire channel (not shown in the figure) extending axially is provided between the two, and the guide wire channel can be used to allow the guide wire to enter.

[0141] In practical implementation, to reduce damage to the blood vessel wall and improve the flexibility of the thrombectomy stent in specially shaped blood vessels, the thrombectomy stent may be flexible; that is, the first or second part of the thrombectomy stent may be made of flexible materials / structures. The flexible materials / structures may include metallic materials and / or polymer materials; the fabrication methods may include at least one of braiding, laser cutting, and 3D printing (3DP).

[0142] As a specific example, the first part with strong radial support can be formed by laser cutting of shape memory alloy, and the second part with high flexibility can be formed by weaving shape memory alloy through weaving process.

[0143] It is understood that the above implementation methods are merely illustrative examples used to illustrate possible formation methods of the thrombectomy stent and should not be construed as limitations of the present invention. The thrombectomy stent can also be configured in other ways. For example, the first and second parts of the thrombectomy stent can be formed simultaneously by laser cutting of shape memory alloy. As another example, the first and second parts of the thrombectomy stent can also be configured to be formed simultaneously by weaving of shape memory alloy.

[0144] As an optional implementation, the thrombectomy device may further include a first filter element, which covers the side wall of the thrombectomy bracket.

[0145] In practical use, the first filter element can further reduce the escape of small blood clots from the thrombectomy stent to the outside of the stent.

[0146] As a specific example, the first filter element is a water-permeable membrane with a microporous structure.

[0147] Specifically, a water-permeable membrane with a microporous structure can prevent thrombus escape while ensuring normal blood flow.

[0148] In practice, the material of the first filter element can be selected according to the specific circumstances.

[0149] For example, the material of the first filter element can be one or more of the following high molecular polymer materials: polyurethane, expanded polytetrafluoroethylene, silicone, polyester, polyether amide block copolymer, etc.

[0150] It is understood that the above embodiments provide multiple implementation schemes, and these implementation schemes can be combined and cross-referenced with each other without conflict, thereby extending to multiple possible implementation schemes. These can all be considered as the implementation schemes disclosed and made public in this application.

[0151] To facilitate implementation, this embodiment of the invention also provides a thrombectomy system, which may include a sheath device and a thrombectomy device. The sheath device is used to provide a channel for the thrombectomy device to intervene in a blood vessel, and the thrombectomy device is used to enter the blood vessel through the channel provided by the sheath device to perform thrombectomy on emboli in the blood vessel.

[0152] As an optional implementation, the sheath device may include a sheath body and a sheath stent, wherein the sheath body provides a channel for the thrombectomy device to enter the vascular cavity, and the sheath stent is located at the distal end of the sheath body to guide the thrombectomy device into the sheath body; the thrombectomy device may include a thrombectomy stent and an adjustment component, wherein the thrombectomy stent may have multiple expansion states, one expansion state of the thrombectomy stent corresponds to one outer diameter of the thrombectomy stent, and the adjustment component can switch the expansion state of the thrombectomy stent.

[0153] In practical use, refer to Figures 6 to 9 , Figures 6 to 9 This diagram illustrates an application scenario of the thrombectomy system according to an embodiment of the present invention. The thrombectomy process of the system is as follows:

[0154] First, the sheath device N is inserted into the blood vessel L via a minimally invasive interventional surgical approach, and the sheath core is withdrawn after the sheath stent N1 is released (not shown in the figure), providing an interventional channel for the subsequent introduction of the thrombectomy device M.

[0155] Subsequently, the thrombectomy device M enters the blood vessel through the channel provided by the sheath body N2, and is advanced to the distal position of the embolus S under the guidance of the guidewire (not shown in the figure). The expansion state of the thrombectomy stent 2 is released and adjusted by the adjustment component (not shown in the figure) so that the outer diameter of the thrombectomy stent 2 is adapted to the inner diameter of the inner wall of the blood vessel L.

[0156] Subsequently, the thrombectomy device M is withdrawn, and the thrombectomy stent 2 successively dissects the embolus. The thrombectomy stent 2 abuts against the inner wall of the blood vessel L to maximize the thrombectomy.

[0157] Subsequently, the thrombectomy device M is retracted into the sheath support N1 and removed from the body through the sheath body N2;

[0158] Subsequently, a syringe or suction device is connected to the sheath body N2 to assist in the suction of the embolus, so as to remove the embolus remaining in the sheath device N.

[0159] As an optional implementation, the thrombectomy device may be the thrombectomy device described in any of the foregoing embodiments.

[0160] As an optional implementation, the sheath device may further include a second filter element that covers the sidewall of the sheath support.

[0161] In actual use, during the process of the thrombectomy stent being retracted into the sheath body, the second filter element can reduce the amount of fine thrombi escaping outside the semi-enclosed space formed between the thrombectomy stent and the sheath stent.

[0162] As a specific example, the second filter element is a water-permeable membrane with a microporous structure.

[0163] Specifically, a water-permeable membrane with a microporous structure can prevent thrombus escape while ensuring normal blood flow.

[0164] In practice, the material of the second filter element can be selected according to the specific circumstances.

[0165] For example, the material of the second filter element can be one or more of the following high molecular polymer materials: polyurethane, expanded polytetrafluoroethylene, silicone, polyester, polyether amide block copolymer, etc.

[0166] It should be noted that the terms "example" or "embodiment" used in this specification refer to a specific feature, structure, or characteristic that can be included in at least one implementation of the embodiments of the present invention. Furthermore, in the description of this specification, terms such as "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with terms such as "first," "second," etc., may explicitly or implicitly include one or more of that feature. Moreover, terms such as "first," "second," "third," and "fourth" are used to distinguish similar objects and are not necessarily used to describe a specific order or indicate importance. It is understood that such terms can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein.

[0167] While the embodiments of the present invention have been disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of this specification should be determined by the scope defined in the claims.

Claims

1. A thrombus removal device, characterized in that, include: The thrombectomy stent has multiple expansion states, and one expansion state of the thrombectomy stent corresponds to one outer diameter of the thrombectomy stent. Adjustment component, adapted to switch the expansion state of the thrombectomy stent, the adjustment component comprising: Main gear shift component; The secondary gear component is adapted to cooperate with the main gear component to form multiple gears, and one gear is adapted to an expansion state of the thrombectomy bracket; A first driving component is connected to the main gear shift component and is adapted to drive the main gear shift component to move relative to the secondary gear shift component to switch gears; a housing is provided in the housing via a rotating shaft and is adapted to rotate relative to the main gear shift component via the rotating shaft; The second driving member abuts against one end of the sub-gear member and is adapted to rotate the sub-gear member so that the sub-gear member disengages from the main gear member; A reset member is clamped between the other end of the secondary gear member and the housing, and is adapted to rotate the secondary gear member so that the secondary gear member abuts against the primary gear member.

2. The thrombectomy device according to claim 1, characterized in that, The housing has a through hole; The second driving member passes through the through hole into the housing and slides in cooperation with the through hole; One end of the second driving member is located inside the housing, and the other end is located outside the housing.

3. The thrombectomy device according to claim 2, characterized in that, The second driving member is provided with a limiting part, the outer diameter of which is larger than the inner diameter of the through hole, and the limiting part is located inside the housing.

4. The thrombectomy device according to claim 1, characterized in that, The main gear shift component has multiple tooth-like structures; The sub-gear component is adapted to cooperate with the plurality of toothed structures to form a plurality of gears.

5. The thrombectomy device according to claim 4, characterized in that, When the secondary gear and the toothed structure cooperate to form the gear, the secondary gear is adapted to restrict the thrombectomy bracket from switching expansion states.

6. The thrombectomy device according to claim 4, characterized in that, The plurality of toothed structures are arranged sequentially along the axial direction of the main gear component.

7. The thrombectomy device according to claim 1, characterized in that, The adjustment component further includes: case; The first traction member is adapted to connect the distal end of the thrombectomy bracket and the main stop member; The second traction member is adapted to connect the proximal end of the thrombectomy bracket and the housing; The second traction component is sleeved outside the first traction component and can move relative to it along the axial direction.

8. The thrombectomy device according to claim 7, characterized in that, The adjustment assembly further includes a storage component, which is sleeved outside the second traction component and can move relative to it along the axial direction.

9. The thrombectomy device according to claim 1, characterized in that, Also includes: A first filter element covers the side wall of the thrombectomy bracket.

10. The thrombectomy device according to claim 1, characterized in that, The thrombectomy stent includes: The first part, located at the proximal end of the thrombectomy bracket, is adapted to form at least one port along the axial direction of the thrombectomy bracket; The second part is located at the distal end of the thrombectomy bracket and is adapted to form a semi-enclosed space with the first part.

11. A thrombus removal system, characterized in that, include: The thrombectomy device is the thrombectomy device as described in any one of claims 1 to 10; A sheath device adapted for passage of the thrombectomy device.

12. The thrombectomy system according to claim 11, characterized in that, The sheath device includes: The sheath body is adapted to allow the thrombectomy device to pass through; A sheath support, located at the distal end of the sheath body, is adapted to guide the thrombectomy device into the sheath body; The second filter element covers the side wall of the sheath support.

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